Beclin-1 - Q91XJ1 (BECN1_RAT)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Plays a central role in autophagy. Acts as core subunit of the PI3K complex that mediates formation of phosphatidylinositol 3-phosphate; different complex forms are believed to play a role in multiple membrane trafficking pathways: PI3KC3-C1 is involved in initiation of autophagosomes and PI3KC3-C2 in maturation of autophagosomes and endocytosis. Involved in regulation of degradative endocytic trafficking and required for the abcission step in cytokinesis, probably in the context of PI3KC3-C2. Essential for the formation of PI3KC3-C2 but not PI3KC3-C1 PI3K complex forms. Involved in endocytosis. May play a role in antiviral host defense (By similarity). UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
A homodimeric form is proposed to exist; this metastable form readily transits to ATG14- or UVRAG-containing complexes with BECN1:UVRAG being more stable than BECN1:ATG14 (PubMed:22314358). Component of the PI3K (PI3KC3/PI3K-III/class III phosphatidylinositol 3-kinase) complex the core of which is composed of the catalytic subunit PIK3C3, the regulatory subunit PIK3R4 and BECN1 associating with additional regulatory/auxilliary subunits to form alternative complex forms. Alternative complex forms containing a forth regulatory subunit in a mutually exclusive manner are PI3K complex I (PI3KC3-C1) containing ATG14, and PI3K complex II (PI3KC3-C2) containing UVRAG. PI3KC3-C1 displays a V-shaped architecture with PIK3R4 serving as a bridge between PIK3C3 and the ATG14:BECN1 subcomplex. Both, PI3KC3-C1 and PI3KC3-C2, can associate with further regulatory subunits, such as RUBCN, SH3GLB1/Bif-1 and AMBRA1. PI3KC3-C1 probably associates with PIK3CB. Interacts with AMBRA1, GOPC, GRID2. Interacts with BCL2 and BCL2L1; the interaction inhibits BECN1 function in promoting autophagy by interfering with the formation of the PI3K complex. Interacts with cytosolic HMGB1; inhibits the interaction of BECN1 and BCL2 leading to promotion of autophagy. Interacts with USP10, USP13, DAPK1, RAB39A. Interacts with SLAMF1 (By similarity). Interacts with VMP1 (PubMed:17724469). Interacts with TRIM5; the interaction causes activation of BECN1 by causing its dissociation from its inhibitors BCL2 and TAB2 (By similarity). Interacts with active ULK1 (phosphorylated on 'Ser-317') and MEFV simultaneously (By similarity). Interacts with WDR81 and WDR91; negatively regulates the PI3 kinase/PI3K activity associated with endosomal membranes (By similarity). Interacts with LAPTM4B; competes with EGFR for LAPTM4B binding; regulates EGFR activity (By similarity). Interacts with TRIM50 (By similarity). Interacts with TRIM16 (By similarity). Interacts with ATG14; this interaction is increased in the absence of TMEM39A (By similarity). UniProt
The coiled coil domain can form antiparallel homodimers and mediates dimerization with the coiled coil domains of ATG14 or UVRAG involved in the formation of PI3K complexes. UniProt
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